box86/tests/test19.c

#include <string.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>

#if defined(__x86_64__)
#error Nope!
#else
uint64_t _fucomip_(double a, double b)
{
    uint32_t ret;
    asm volatile (
    "fldl %2\n"
    "fldl %1\n"
    "fucomip %%st(1)\n"
    "fstp %%st(0)\n"
    "pushfl\n"
    "popl %%eax\n"
    :"=a" (ret):"m"(a), "m"(b):"cc");
    return ret;
}
uint64_t _fucompp_(double a, double b)
{
    uint32_t ret;
    asm volatile (
    "fldl %2\n"
    "fldl %1\n"
    "fucompp\n"
    "fstsw %%ax\n"
    :"=a" (ret):"m"(a), "m"(b):"cc");
    return ret;
}
uint64_t _fistpw_(double a)
{
    uint16_t ret;
    uint16_t t1, t2;
    asm volatile (
    "fldl %1\n"
    "fstcw %2\n"
    "mov %2, %%ax\n"
    "mov $0x0c, %%ah\n"
    "mov %%ax, %3\n"
    "fldcw %3\n"
    "fistp %0\n"
    "fldcw %2\n"
    :"=m" (ret):"m"(a), "m"(t1), "m"(t2):"cc");
    return ret;
}
uint64_t _fistpl_(double a)
{
    uint32_t ret;
    uint16_t t1, t2;
    asm volatile (
    "fldl %1\n"
    "fstcw %2\n"
    "mov %2, %%ax\n"
    "mov $0x0c, %%ah\n"
    "mov %%ax, %3\n"
    "fldcw %3\n"
    "fistpl %0\n"
    "fldcw %2\n"
    :"=m" (ret):"m"(a), "m"(t1), "m"(t2):"cc");
    return ret;
}
uint64_t _fistpq_(double a)
{
    uint64_t ret;
    uint16_t t1, t2;
    asm volatile (
    "fldl %1\n"
    "fstcw %2\n"
    "mov %2, %%ax\n"
    "mov $0x0c, %%ah\n"
    "mov %%ax, %3\n"
    "fldcw %3\n"
    "fistpq %0\n"
    "fldcw %2\n"
    :"=m" (ret):"m"(a), "m"(t1), "m"(t2):"cc");
    return ret;
}
uint64_t _frndint_(double a)
{
    uint64_t ret;
    uint16_t t1, t2;
    asm volatile (
    "fldl %1\n"
    "fstcw %2\n"
    "mov %2, %%ax\n"
    "mov $0x0c, %%ah\n"
    "mov %%ax, %3\n"
    "fldcw %3\n"
    "frndint\n"
    "fstpl %0\n"
    "fldcw %2\n"
    :"=m" (ret):"m"(a), "m"(t1), "m"(t2):"cc");
    return ret;
}
#endif

int main(int argc, const char** argv)
{
 double a, b;
 char pf, cf, zf;
 char pa, ca, za;
 uint64_t flags;
 uint64_t tests[][2] = {
  {0x0, 0x4082c00000000000LL},
  {0x8000000000000000LL, 0x4082c00000000000LL},
  {0x8000000000000000LL, 0x0},
  {0x8000000000000000LL, 0x3ff0000000000000LL},
  {0x3ff0000000000000LL, 0x3fe89d9000000000LL},
  {0x3ff0000000000000LL, 0x7ff0000000000000LL},
  {0xfff0000000000000LL, 0x7ff0000000000000LL},
  {0x3ff0002ca0000000LL, 0xaeff000025000000LL},
  {0x3ff0000050000000LL, 0xc082c00000000000LL},
  {0x0, 0x7ff8000000000001LL},
  {0x7ff8000000000001LL, 0x7ff8000000000001LL},
 };
 int n = sizeof(tests)/sizeof(tests[0]); 
 for(int i=0; i<n; ++i)
  for(int j=0; j<2; ++j) {
   *(uint64_t*)&a = tests[i][0+j];
   *(uint64_t*)&b = tests[i][1-j];
   printf("FUCOMI 0x%llx 0x%llx ", *(uint64_t*)&a, *(uint64_t*)&b);
   flags = _fucomip_(a, b);
   ca = (flags>>0)&1?'C':'-';
   za = (flags>>(0+6))&1?'Z':'-';
   pa = (flags>>(0+2))&1?'P':'-';
   printf("%c%c%c\n", za, pa, ca);
   printf("FUCOMPP 0x%llx 0x%llx ", *(uint64_t*)&a, *(uint64_t*)&b);
   flags = _fucompp_(a, b);
   ca = (flags>>8)&1?'C':'-';
   za = (flags>>(8+6))&1?'Z':'-';
   pa = (flags>>(8+2))&1?'P':'-';
   printf("%c%c%c\n", za, pa, ca);
   printf("FRNDINT 0x%llx => 0x%llx\n", *(uint64_t*)&a, _frndint_(a));
   printf("FRNDINT 0x%llx => 0x%llx\n", *(uint64_t*)&b, _frndint_(b));
   printf("FISTP 0x%llx => word: %x\n", *(uint64_t*)&a, _fistpw_(a));
   printf("FISTP 0x%llx => word: %x\n", *(uint64_t*)&b, _fistpw_(b));
   printf("FISTP 0x%llx => long: %x\n", *(uint64_t*)&a, _fistpl_(a));
   printf("FISTP 0x%llx => long: %x\n", *(uint64_t*)&b, _fistpl_(b));
   printf("FISTP 0x%llx => quad: %llx\n", *(uint64_t*)&a, _fistpq_(a));
   printf("FISTP 0x%llx => quad: %llx\n", *(uint64_t*)&b, _fistpq_(b));
 }
 printf("\nDone\n");
}